Rice straw management options impact soil phosphorus adsorption-desorption, kinetics and thermodynamics in rice-wheat system of north-western India

IF 6.1 1区农林科学 Q1 SOIL SCIENCE

Soil & Tillage Research Pub Date : 2024-12-09 DOI:10.1016/j.still.2024.106403

Sandeep Sharma, Paawan Kaur

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Abstract

Fluctuations in soil management practices, temperature and moisture conditions can impact adsorption-desorption and bioavailability of phosphorus (P) in agricultural soils. Therefore, this study investigates P dynamics in straw-managed soils of Punjab collected from five treatments namely (1) conventional tillage (CT) after removal of rice straw (CT-R), (2) Treatment 1 plus biochar amendment at 2 Mg ha⁻¹ (CT+biochar), (3) zero tillage with straw retention as mulch (ZT+RM), (4) CT with straw incorporation (CT+RI) and (5) CT after rice residue burned (CT+RB) after three years from an ongoing experiment in rice-wheat cropping system. The adsorption-desorption of P followed pseudo second order kinetics (R²> 0.99) and Freundlich isotherm (R²> 0.95) for all the treatments and temperatures. Freundlich adsorption capacity (K_Fads) varied with the physico-chemical soil properties and ranged from 10.9 to 28.5, 14.3–32.2, 18.3–40.2, and 22.5–56.5 μg¹⁻ⁿg⁻¹mLⁿ at 15, 25, 35, and 45 ± 1°C, respectively. The sequential order of P adsorption was as follows: CT+ biochar > CT+RB > ZT+RM > CT+RI > CT-R, irrespective of temperature. Thermodynamic parameters revealed feasible, spontaneous and endothermic process indicative of physio-sorption via. hydrogen bonding as the dominant mechanism in in-situ straw managed soils. The Freundlich desorption coefficient (K_Fdes) ranged from 54.8 to 85.2, 39.9–60.8, 23.4–37.0, 29.6–45.7 and 19.4–36.7 μg¹⁻ⁿg⁻¹mLⁿ in CT+ biochar, CT+ RB, ZT+RM, CT+RI, CT-R, respectively at studied temperatures and was greater than adsorption in all treatments indicating hysteresis. The desorption sequence was observed as: CT-R > CT+RI > ZT+RM > CT+ RB> CT+ biochar. The greater adsorption and slower desorption of P under in-situ straw managed treatments (CT+biochar, CT+RB and ZT+RM) than CT-R and CT +RI, particularly CT+ biochar compared to CT-R will lead to more P retention in soil matrix thereby preventing eutrophication and deterioration of surface waters.

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水稻秸秆管理方案对印度西北部水稻-小麦系统土壤磷吸附-解吸、动力学和热力学的影响

土壤管理方法、温度和湿度条件的波动会影响农业土壤中磷的吸附-解吸和生物利用度。因此，本研究调查了旁遮普省秸秆管理土壤中的磷动态，收集了五种处理，即：(1)秸秆去除后的常规耕作（CT）（CT- r），(2)处理1加2 Mg ha - 1的生物炭改良（CT+生物炭），(3)秸秆保留作为覆盖物的零耕作（ZT+RM），(4)秸秆加入的CT （CT+RI）和(5)稻渣焚烧后的CT （CT+RB）经过三年的稻麦种植系统试验。P的吸附-解吸符合准二级动力学(R2>；0.99)和Freundlich等温线(R2>；0.95)所有的处理和温度。Freundlich吸附量（KFads）随土壤理化性质的变化而变化，在15、25、35和45 ± 1°C条件下分别为10.9 ~ 28.5、14.3 ~ 32.2、18.3 ~ 40.2和22.5 ~ 56.5 μg1−ng−1mLn。P的吸附顺序为：CT+ 生物炭>； CT+RB >； ZT+RM >； CT+RI >； CT- r，与温度无关。热力学参数显示了可行的、自发的和吸热的过程，表明通过物理吸附。在原位秸秆管理土壤中，氢键是主要机制。在实验温度下，CT+ 生物炭、CT+ RB、ZT+RM、CT+RI、CT- r处理的Freundlich解吸系数（KFdes）分别为54.8 ~ 85.2、39.9 ~ 60.8、23.4 ~ 37.0、29.6 ~ 45.7和19.4 ~ 36.7 μg1−ng−1mLn，且均大于吸附。解吸顺序为：CT- r >； CT+RI >； ZT+RM >； CT+ RB>； CT+ 生物炭。秸秆原位处理（CT+生物炭、CT+RB和ZT+RM）对磷的吸附比CT- r和CT+ RI更大，解吸更慢，特别是CT+ 生物炭与CT- r相比，将导致更多的磷滞留在土壤基质中，从而防止富营养化和地表水的恶化。

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来源期刊

Soil & Tillage Research 农林科学-土壤科学

CiteScore

13.00

自引率

6.20%

发文量

266

审稿时长

5 months

期刊介绍： Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.